In this section:
Models 4220-PGU and 4225-PMU ........................................... 4-1
4200A-SCS power supply limitations ....................................... 4-5
Pulse source-measure concepts .............................................. 4-7
Measurement types ................................................................ 4-23
Models 4220-PGU and 4225-PMU
The 4220-PGU High Voltage Pulse Generator Unit and 4225-PMU Ultra-Fast Pulse Measure Unit are
high-speed pulse-generator cards for the 4200A-SCS. The 4220-PGU provides pulse output only.
The 4225-PMU provides both pulse output and pulse measurement. The PGU and PMU have similar
pulse output characteristics.
The 4225-PMU can be paired one or two 4225-RPM Remote Preamplifier/Switch Modules. When the
RPM is used as a preamplifier for the PMU, it provides additional low-current measurement ranges.
When the RPM is used as a switch, it switches between the PMU, SMUs, and CVUs.
LPT functions that pertain to the PGU and PMU are documented in “LPT commands for PGUs and
PMUs” in Model 4200A-SCS LPT Library Programming.
To do quick tests with minimal interaction with other 4200A-SCS test resources, you can use the
Keithley Pulse Application (KPulse). KPulse is a non-programming alternative that you can use to
configure and control the installed Keithley pulse cards. Refer to KPulse (on page 5-1) for additional
information.
The simplified circuits of the 4220-PGU and 4225-PMU pulse generators are shown in the following
figure.
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